Existence and multiplicity results for an elliptic problem involving cylindrical weights and a homogeneous term μ.

Abstract

We consider the following elliptic problem ⎧⎨ ⎩ − div |∇u| p−2 ∇u |y| ap = μ |u| p−2 u |y| p(a+1) + h(x) |u| q−2 u |y| bq + f(x, u) in Ω, u = 0 on ∂Ω, in an unbounded cylindrical domain Ω := {(y, z) ∈ Rm+1 × RN−m−1 ; 0 <A< |y| <B< ∞}, where A, B ∈ R+, p > 1, 1 ≤ m<N − p, q := N p N − p(a + 1 − b), 0 ≤ μ < μ := m + 1 − p(a + 1) p p , h ∈ L N q (Ω) ∩ L∞(Ω) is a positive function and f : Ω × R → R is a Carath ́eodory function with growth at infinity. Using the Krasnoselski’s genus and applying Z2 version of the Mountain Pass Theorem, we prove, under certain assumptions about f, that the above problem has infinite invariant solutions.